“What is software testing? To us, testing is the evaluation of the work products created during a software development effort. This is more general than just checking part or all of a software system to see if it meets its specifications. Testing software is a difficult process, in general, and sufficient resources are seldom available for testing. From our standpoint, testing is done throughout a development effort and is not just an activity tacked on at the end of a development phase to see how well the developers did. We see testing as part of the process that puts quality into a software system. As a result, we address the testing of all development products (models) even before any code is written.”